Introduction
The hose clamp is a seemingly minor component, yet it is critical to the integrity of the entire discharge line on a Feldbinder silo trailer. It is what holds the hose onto the Storz connector spigot under working pressure — and a leak at that point means material loss, reduced discharge performance, and the risk of dust release. On horizontal non-tipping trailers of the EUT series, clamps secure transport and compressor hoses; on tipping silo trailers of the KIP (Kippsilo) series — where pressurised unloading takes place with the tank raised hydraulically — selecting a fastening of the correct strength is even more important.
From a Feldbinder service perspective, three decisions matter: the type of fastening (quick-fit GBS clamps for spigot connectors, or the more secure shell couplings for plain connectors), the material grade (galvanised W1 for standard applications, stainless and acid-resistant W2/W4 for food-grade EUT 316L variants), and the size matched to the hose diameter. PHS Magnum holds the full range — from stock GBS clamps through to shell couplings and worm-drive clamps available on direct delivery.
Specifications and materials
GBS hose clamps
| Feature | Detail |
|---|---|
| Application | Industrial and compressor hoses |
| Material (standard stock) | Fully galvanised steel (W1) |
| Screw | Hex head, class 8.8 |
| Band width | 18 mm |
| Standard | DIN 3017 |
| Sizes | From 17 mm |
| Direct delivery | Full GBS range in stainless (W2) and acid-resistant stainless (W4) |
Shell-type couplings
| Feature | Detail |
|---|---|
| Application | Plain suction connectors (shell-mount type) |
| Set per hose end (one connector) | 2 shell halves, 4 mounting bolts, 4 nuts |
| Material | German aluminium |
| Standards | DIN 2817, DIN 2826 |
| Standard size (stock item) | 75x10 (for DN75 hose) |
| Direct delivery | All sizes and forms in aluminium and stainless steel (size 75x8) |
Double-bolt and worm-drive clamps
| Feature | Detail |
|---|---|
| Application | Every industrial and automotive line |
| Size range | Full range |
Sizes and types
- GBS: 17 mm to 130 mm, 18 mm band, DIN 3017 — galvanised W1 (stock), stainless and acid-resistant W2/W4 (direct delivery).
- Shell couplings: 75x10 for DN75 in regular stock; full range of sizes and forms (aluminium, stainless 75x8) on order.
- Double-bolt and worm-drive clamps: full range for auxiliary lines.
GBS clamp size is selected to match the outside diameter of the hose pushed onto the Storz suction connector spigot. Typical hose diameters with corresponding Storz connector sizes for GBS-clamped assemblies:
| Storz connector size | Hose diameter | Gasket |
|---|---|---|
| C (52) | 50 mm | Black NBR |
| B (75) | 75 mm | Black NBR |
| A (110) | 100 mm | Black NBR |
| A (110) | 110 mm | Black NBR |
Compatibility with Feldbinder silo trailers (EUT/KIP)
- EUT (horizontal, non-tipping) — GBS clamps for transport and compressor hoses mounted on Storz spigots; food-grade 316L stainless steel variants require stainless or acid-resistant grades (W2/W4) and stainless shell couplings.
- KIP (Kippsilo, tipping) — for pressurised unloading with the tank raised hydraulically, shell couplings (DIN 2817) are recommended as the higher-reliability fastening.
Fastening type is selected according to the Storz connector type and hose diameter on the specific trailer — when ordering, please provide the DN size and assembly method. Full catalogue: spare parts.
Common issues on Feldbinder silo trailers
From our Feldbinder silo trailer service experience, the most frequently recurring problems with hose clamps are:
- Corrosion of galvanised clamps (W1) during washing and transport of moist materials — switching to stainless (W2/W4) resolves the issue; mandatory on food-grade EUT 316L trailers.
- Stripped GBS screw thread from over-tightening — requires replacement of the entire clamp; damaged screws are not repaired.
- Hose deformation under an undersized clamp — restricts bore and flow; specifying an 18 mm band to DIN 3017 protects the hose wall.
- Loose shell-coupling nuts after KIP pressure cycles — torque should be checked at every service; replacement bolt and nut sets are supplied as a kit.
- Wrong size after hose replacement — when the hose type or diameter changes, the clamp must be re-selected accordingly.
Service life figures are not quoted without evidence — longevity depends on the medium, frequency of assembly/disassembly, and operating conditions. Clamp replacement is carried out as part of our silo trailer service.
Availability and delivery
The PHS Magnum warehouse in Chorula near Opole holds standard GBS clamps (W1) and 75x10 shell couplings in stock for immediate dispatch. Stainless and acid-resistant grades (W2/W4), stainless shell couplings 75x8, worm-drive and double-bolt clamps are sourced on next-day direct delivery. Courier delivery throughout Poland and to DACH countries.
Related categories
- Storz system — connectors secured with clamps
- Pneumatic hoses — clamped with GBS clamps
- Non-return valves — pneumatic line fittings
- Full spare parts catalogue
- Silo trailer service — PHS Magnum · Aleksy Pasternak — pasternak.me
See also: This category in the full PHS Magnum network catalogue (all brands) →
Author: Aleksy Pasternak — Managing Partner PHS Magnum, 20 years in the industry, ISO 9001:2015 internal auditor (DEKRA).
